Received: 15 September 2017
Accepted: 5 July 2018
First Online: 20 July 2018
Ethics approval and consent to participate
: The study was approved by the local ethics committees of the University of Marburg, reference number 2014–08-k, and the Medical University of Isfahan, reference number IR.MUI.REC.1394.1.73. All participants gave written informed consent before participating in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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